(The man who shot dead two police officers and a civilian in the Belgian city of Liège had killed someone the night before the attacks.
Interior Minister Jan Jambon said the gunman, Benjamin Herman, had murdered a former prisoner he met while in jail.
Reports say the victim was Michael Wilmet, 30, a convicted drug dealer who was hit repeatedly with a hammer.
The two policewomen killed the next day have been identified as Lucile Garcia, 53, and Soraya Belkacemi, 45.
The third victim, 22-year-old Cyril Vangriecken, was sitting in the passenger seat of a nearby parked car when he was shot.
Prosecutors say they are treating the attacks as “terrorist murder”.
The Islamic State group (IS), which has claimed previous attacks in Belgium, said it was behind the shootings, but has not offered any evidence to support this.
